SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1db89575d6d9ded5d63823815e3a57b8a2f2e592c956f426d49cc73884f8de7' 
  AND token = 'fZ7/CHICDirdhXWQ0+gdSAkNRdGqLB7uKSCoDh0BReI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

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