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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1476eec6212230758378f8442fb87697fea5961b4c7076e7585298b4a452ac4a' 
  AND token = 'd5P9/jGEw20gQq+Jm0919dE1YT1pWxxCrXmAdvOlwic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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