SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd4c2bea52d21f2b546ff05c598cb11548b9c6e32f1c88568057f907c922ab1' 
  AND token = 'DKHLYYM+DgLbtg0KuJTV4ZFUXKJEMWH+naiEIH/q4QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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