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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd128d2e079b64109dc4522f94bba88f7c728634de0cff86d0110ac1b4df388fb' 
  AND token = 's3gAmd1j1h4HRNfnnW302ec62zpaISTkGOicMgD2AEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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