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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb29e2bfc77cb6f5fed03a26288ccd20387fa75aff1aa35b46cc58888cae6296' 
  AND token = 't4pBgrJBMZnDqa4D5bbBjf1QCH5lSHzPx41F7G3BY1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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