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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ffe38ecfbfa64076476db531d341c4d7d475f73b88093a28634b3618c44690' 
  AND token = '02AE67Pe1oXaeTQZ2Zu6XwsLxLTfjEB2mC4y1vSg8B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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