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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3f3c4f47064530bfae4ea74cd90642aee4ab9340e63569c480730731ad9675' 
  AND token = 'E+2/0aLC857rf99lAROC3vbEG6C7DXJg/hRiiQaumkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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