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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f06b8eda3ca101b901f59cd27ea3672a5f358b07f046a9c29d1c553f8e29942' 
  AND token = '3wfWBOKywECUWNz1boatbeuGuXxTyAhH49WayQ9TrXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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