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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e0c469ac124f6c892689744ea678d78cfae1195a5379f146b31d559a6742d4' 
  AND token = 'ir05uhytvFJzes7rOnwTCHb3ju1hzk2oeCf89ipx4lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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