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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3c60c9c84c5e14c9dcbfce1a8d7d5a9b3eb1211b3ddb47886a3b46671fc8e0' 
  AND token = 'mxhviva4xDlIkJZmtNsavZAVdA8obk5xdrZi+mJjjpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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