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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bb5c8babe5ed8a54f459f297ea494c6aee5f1cb9d14d19041443db2dd29d8f' 
  AND token = 'OXT9A4fEfIUiucTkvgUQgrFGMmWdJ5ZRYxqfY/JGzk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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