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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3468a83cb2be2dd7529ae7ca85ef3e944406eef5f2433a96f62688b55edb72' 
  AND token = 'qrzDizCxHUrVAb8rN97xFNCteT78qFUhTd3VUEQD/W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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