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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976a89bc96ec4fa6c879f27edd35c0d8e7aabd7c100fe3a475d1fd0fe32bc0ba' 
  AND token = 'kekaPVZWb9Pfpb4tdJeWo8nMvmQF5mHxd3HWNHwaoic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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