SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf075f0ae2946cbf563207af1c510a2d90b27ff1b7d06e4492bef4cec1536c8' 
  AND token = 'oPSwRzXQh2C2X+Dn6X9ymxQzM/p37E6KR5KtPMn0Uc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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