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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4feb1c2ed8af251df0cd9f3ff24edf9c2ad90a5e466532919fc575532bba44d3' 
  AND token = 'jRs0s4VgMQZy2Fkn3Kxo1cS/azYlq8AVGJIixxWLywk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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