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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e731dd62a6fcdde4381c2c93dedc2a04be69fc2b9e084aaeae77bfb5749614e3' 
  AND token = 'um7CWn6KYmsRKNjfU7fD9gB1q76jrYOJo8yxK4OB06M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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