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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb7f6d0c389ae1d53262fb19d283ba73238025a6494ff246be31f81886a3ec1' 
  AND token = '8dlOyMtfN1qM0H1DTKGQ78DZBe8Pk8DnF/+XeWpiSBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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