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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c2e57d5f09d030a91e2e14a7770bee07e22baac66cc0cc4db0fa1805404b08' 
  AND token = 'Y6OIxoQif9gr6LWeNfRsuuqTClVEpGjDrPOeyrYGZgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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