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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97298543fd9ee942a6273cba1facbe394003ba724ccf33b884ed08fad49ef4f2' 
  AND token = 'UTZENjUY3taQmn7SHFdBuHDX5xnyqNr+0lNwcw2UcVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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