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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1add7f5056f8590f7d5f4628975afe1b84f358ea514c96eea2389427987043f1' 
  AND token = '9h605tZIhup7/2edYPuGsFEJ2sz1R5hbQW0IYlsCh0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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