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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d1a35c43b400bcc5a819dcd1c2f4f3250cc05b049065b7f1e364d270ef0cd5' 
  AND token = '8p9OFzjMSJOQApk+pPY1waRoe/V2AeyjgC/YgSpNtSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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