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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11b1a1b37b1a304383c9a59ef1c0cc5807ee6e04ea2f8140b92934d5ebb1993' 
  AND token = 'CUZrxGLbQpPe3yCocUv3ibiElfjxl8NAr/8n1JdEF/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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