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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab027c6cc2b46ff9b5266e177aa91431e8e36feffe02054841f8fe628f1103dc' 
  AND token = '2pWWKzJQXQ3vYF5NO0nBJbg6iOxRSxDJbwF1oy8M9IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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