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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '434d38f8003eb2b512c89e8ee3f62db98d99af2f0a913d9f04a71d535d8e6a10' 
  AND token = 'SPwyPc8jC5qObMKsZrwgML4ehDOTZo74mX9SvV/aKXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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