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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac5121e282ade840dd70ac9f7ad2fe5ab094986113f3e97a6b496ff682e2282' 
  AND token = 'GytmEHMmS+do+ppdpN670SbFoeNYc1V5j2A4rf1ue2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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