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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6160b032b2a6676e68ea3e4e689cd5c28b347a1ebd5be1926e6332c41bd94067' 
  AND token = 'dshn0iTPzATK2VNnBoEz7qwZn/D7ifXSZYWbjD5QabQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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