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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4b5d60bab5d3c738f1675a17afe0e3ce93f2ecddbc291bdef90839bf6345c0' 
  AND token = '+4t8NobNnNdIGldBCXayCXfeQbckuZPBtA1NGNDwSJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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