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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659b8a28744b3c5809cce68ec91b3bb898b4e6ea9e3b50950ea7125e2baed7bd' 
  AND token = 'Y8CqTZUmO109xmefJdB6Kce/4NR84eXC+SzYXi5DwH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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