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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d16204c7f2d5a3b6d311d5beec01d21732ffc811ee199c820fc24e2ae41c41' 
  AND token = '7wimgu8pk0Isr6kZR9rYLxhPqmPLoJuGC976Z2sBkHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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