SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11191b2899a0cfe6c1cbcbc7a8b4c1e956530becbd3e64c47eaea55fac83b25' 
  AND token = 'zHFh/Wvd8ZQC71GVplG/tGg3mjdL5BzUlTOsYjOAb4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}