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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416b4aba3f9ece0528bdfb7820976ca06f480059741509143a205fb276b91932' 
  AND token = 'UIDYQatHhMQDUxtUmfdn9uWKS3z4+d7z1sV7C1kKz9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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