SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf0a27579e77fbe775cf5b3886621a9ef87eac3f8de2c8d7c794d9647aa522f' 
  AND token = 'N2P4m4Gw3EGsTqlvhAYORI6nv9KBfxzB+gMbaH5txXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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