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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d42d3faeb6623ee9f4cf83690f01aa615c4d199d41ca5937921ef84e170aa21' 
  AND token = 'xkdBOSEGgDxfc1ESxQ7YVp+lgLiutcuQnYq3qbQkLfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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