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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfa8efb60ed393f99b7257dd64505ea801ffef2104f0a3e83a983939acf1f05' 
  AND token = 'l52VjboFa61H+W9oLndBZuQ6h1R577kpw9vUHsSWtv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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