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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fed84f10c44c0705dc040084b9a36d6ac2d445ecac230592791c3cdfa48db32' 
  AND token = 'M1938c0CcjVn6WRtp4V1SqJM+ZYSygN0GqODlmVhLpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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