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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049d2e15bfb4068152ef5d656e416b1496808bd898760874c16685c77e776e0a' 
  AND token = 'QluEX2D10RE5EWuDe6jlnaYNAxbtL8gS4nCRGa2S810=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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