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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05dcda46fec9b1ff7a4f2054fe025f1d69a1e4b0feb4b28d303d9684c86dced1' 
  AND token = 'zY6XjI8GGh2e72CMyGnHgo2ztbsLymJ24pqGEMatGss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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