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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76d91898fbffb4f4fec8b012c39e0411d8a39d49e6f516350abadd477e024df' 
  AND token = 'kpd19nsg4Iq60Lpkblvdgx4zYZrBupwwxWm04XRgfZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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