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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669831b5dbf6c8f80f0ca791a4073d8e882a7136d06874e0ae4cbff606afa1d1' 
  AND token = '8X7x28cszTwA+sq+g1fwiKJeckltgN617uuLeGmDqjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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