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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ebbfe9d6bedd62e299d7a73af3fed27be50e822649ed4927ca33fcd74acc7b' 
  AND token = 'Z3UCT9lOk4FLW6CVHSJi+iV6zkGWizy/htAq5w5n+BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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