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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73a686af50296c96fcc80041f8a8d6b8c2844c6d6811c19564801ab0e2744ea' 
  AND token = '/z2vNRr14h/odrKFfqr+zD1PiroUWNGkajTn+uvJxy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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