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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa79f2b080c056363078a30e0f6d3c87c2463a45f6ff9a67b6621c70ea147ae7' 
  AND token = 'oZIGjCLtewhIgN4KV4mffTdeksn3fxAT674csQMlrds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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