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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08860fb6755876cf07aa2b86f244316b5c91dee37e01b599a53d5dacd2ccf39' 
  AND token = '1Ek9iyEM2yGKacU2/zlh2Bo0TaQXVWFdisq0ZrTFMSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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