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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d25f6670e75e27f3bc43db8f7b7d6e36ef91713cfe234cf8f9c6c65ed22884a' 
  AND token = 'DlvHus5K1YECAKvEVbknieQLJh3I0spwSbPj8ypbkbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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