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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa70982d0f6b0ff03d26e470a3f0e859d74be41c45bcb74bc60d763ba339a372' 
  AND token = 'TAGT9vFUmOsZS9s7YK5rpxsWTDWYKOjezbZrT1ZXi14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables