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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5efab0f7188e4f9435092303fc78ef356f304c794ebf7dae9f7a867c575a59b' 
  AND token = 'QbXqyfseCqN9/TvfuZRKe7fLGHL+aLwE5c96b+okmEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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