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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23dea8b123263f2da38c6db1d2653ac76569f967213435a1505ab522ca93f50f' 
  AND token = 'CqVt05LrLOqBVRlZ2sgsiqpFTKzSJZZn4EqJIysGo1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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