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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa5c62710d02c33b49d7897af074257f7ae4ce98ca39e04576b2e4d597922b5' 
  AND token = 'mpOZxxRaCxQpFGVEgfzmzL7Qvg+xRf6x0JrddFafTDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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