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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168d781417662d8a24fc7505380aa810e8951921f874155f2d1d1634926d1561' 
  AND token = 'qczqVXn5GN5ruMgqNFLGvXPR41J49ySzqBY04UIbrSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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