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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbba7086c2ae8c7f8577743f5b4c0566a6a81f108f0f448f186a7801ef36317e' 
  AND token = 'ATRg0DPXgZMZsw+vxhzmXvaj156JqGTyjMOotUaDr+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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