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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ecb9228db5ab9cc9dc1b5a3fe865119d37d324f56837da62652cf284b317c6' 
  AND token = 'LwHr1hXILGbzyPA1mCXA82YVjrzUIOyXgRTn33FboMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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