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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f66349cfefd6dbaee21fdeda52ce3c5d7b0ffbabc2bf9f6d38ae5d5effa757' 
  AND token = 'DqNT/Hu1duoQbwd0ahA9jZ2eWwtwWrvTFLKEFvuhZEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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