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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b4f93f650bc1e11145a9b35afbc73a152e4aa92be9f9617eabd547a3137965' 
  AND token = 'rbCV8oTtrEvKK36RWB23QRdih1zBBV/JgFhHgr5DfuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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