SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b57fffef808b2cf3c73b81424db89f19dac006b3f7b0c37a456926ff1b6a1eb' 
  AND token = '/ostbnhbSqOquj+nK2KBJgjSvmg+HGRqr2BswW9gKbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

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