SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5561476e7eaf63af9fdf2528f0848a32e7dbd231913db3a8cf42cf5735132ca0' 
  AND token = 'p7ugwSjzUN0pDuTC8PGPjpJEhQTTIN4NdS/5RmnKCC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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