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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da476f3e28c81b0fd84cec39bc6345fd9f291fcc4fcf73842762366277784de7' 
  AND token = 'TYz9OeXeNDVyQiMrBUUlFCU8SSHlX3dj4cEpE93keAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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