SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda99b424a42b64fca1f9a95d34728b51baf6a0ad7fc322ffc01eeef3be966fa' 
  AND token = 'c0QyzZ1ti+iaJsvCitkP9qNd82XISw23tjMFc3q0o/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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