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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5493e07707083df72acf5e233b8fde1fed53c0d45e7c2f52c8902cd4893d955f' 
  AND token = 'LZ7zd60/2ysM15YyuW8Hi5uRzexp80jyI8/ojLl7DVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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