SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4573e2531d2ef892d0e9477fbb04c3f33e9c7dda5a18283f4c7cc252dbc651' 
  AND token = 'agRSudlWkZuOxHJnLqItBVHD8r/Q0nauixbhoIIzJvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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