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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f281b3c8b2a85458764adf60a90a541a3b1d9e3ede9d59e8e0ec8d261592c4' 
  AND token = 'ymu+pGHrcQHFlTXmDjg4xqkDbLm1OAQ9awe+1FhHgbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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