SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485bb08398679618d886ba4ce4d58ae51d776945e57199bf1f268167afc7b566' 
  AND token = 'aCwqgnjF9PDVV7HVD4bzWlQScLnU5uQmQwXJ5KBAQj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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