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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e4b652dc04ee6653831d1c897b8993e40bc8560e19b6b393ae594cd1e118d3' 
  AND token = '5Dm7jqr/ALSo8U5P4qSTOCx7UCFQzJmynweMARmeYUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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