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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744988ecc3f2a3a72aeacc8860baf69c74044d2b54677eeb44fab0d86d4d0447' 
  AND token = 'JXhCGklAJXjqtxrlZDX7JERweDl9VzMv23PYldnFU6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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