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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18896cc903b06a8e2951fac069f055af75c9c24b74fe826f699073136b66fe1b' 
  AND token = 'PdhnXaVaUdmj4dgwZbAD81JQu0Jm3DkBGmsT9GhBNDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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