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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469f53178ea9e1f23b215d9ef83c7735df716fc78d684ab632f547ac1f761e71' 
  AND token = 'v5Jaem98D7xmhhYhOZkT9m1CsuH33GXxPZCsw701pIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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