SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b776765f9bd47c93243a2c32d97ac2ad64e82001d2dd0f3eeaec0d9f3806ab44' 
  AND token = 'k+unRpnM0gzNHOqiHUWLKa4ThthUgz8Jq8LY6wAPSVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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