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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595099f161dbfbe61b0c6d9262bc71f7c9471c5f04c766181a56674501740871' 
  AND token = 'BZ8vix29fOuuY9pvlE7Q0SWs+Kpv952YC8tl9ozRG4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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