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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e11291996abb6d834e10d84b591776229fd2f235f2ec7279273a7d0613b42b7' 
  AND token = 'LzXkXQwa92FkOHuDj66wSbHqoqV1wRo3gwCY2AJkT2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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