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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee811b64a0e4d9b00307add402d8cab0c88fdd63948cc6a33f84b4ed69adb901' 
  AND token = 'iS1IToFpptrJkQiCgCZqtZNJMq8mQrFQFFMFcX7aSA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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