SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6772448c697f88be6c3b6c0801adff9e6057c3536e51bb12fd57ad500124c0' 
  AND token = 'nCGIprg2dQZSwHUJLeVv4vch7KCInwV82ANf8GWFo10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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