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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ab46b651c237529cfe042ba9837e921fed9f27be35e9744eb0c636f9f35966' 
  AND token = '478WbTVkit0qBU3XB5Ww6o4IrEJxGP8MbSpZ9fCMSPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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