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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc65f017874729fd225150804ffc4619bcefbd08e92666f076b9c68ff387df0' 
  AND token = 'pR6BpqwGyUTaS6QVoNYXnSoplP4GeqY85PcwglhNuso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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