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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b82bb2fbbb0ea91fbb300739a134eef0e12fce7bbe89edc524124e985534e99' 
  AND token = 'WQdiIX6pjD/ol0lfVQ1/X7Pnv+V6lqxK+UX5mnZnwq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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