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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ef5d26444559ef99562934774689052424624627bb48d0517b0a55d0cc5cae' 
  AND token = 'P4qF9wkosLGonvfvi54T7+YeSUikJf56OvqFh7LEIjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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