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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea34c0ad43e150f3b9933b5b746f8672dc6ad4e5297f938182f2b07c4fc08455' 
  AND token = 'pP8l2H22e8PFY7TFCsB+5aKwufcZUD7aTxJRsx0Cg7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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