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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853ee2e5ed9f755efcf4d170d8e57d335d0cc0487b140fc7a06cfe2e052d737d' 
  AND token = 'h7HcXdhotdS197Nc6MHmfg7ETkshM6uZqfMEo3UTo4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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