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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3476bfe196aa52c69ec59b013c232453579bd8b40a502e994186b1a2576d898' 
  AND token = 'K457Dm5J1IVPs+AYb9aI4erA9AHVruVMPvliEaB3/1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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