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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547a19739882497ef41bb39ec058799b89e7f1f91cef7404891cb6609ce07e11' 
  AND token = 'lirPvWahfhK/VnfcvC2jSwQ5FgMI3qTiw+ba0SKllgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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