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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d953cd7cb6dd1547f16bf6e2158f1eb5164642e2823c45eb07c6971888eb3e' 
  AND token = 'jEhdqe40MNU77/9VYyakj36LfbNfPntn7aP38vRichI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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