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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9663a957b92b4834f7ca86be4eff47c2069dbdc31c82867494aac1d06fdd86' 
  AND token = 'QW9PdkYXazrcOQ4OryeLbo1QWNVmwmF5Z9soztdrh5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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