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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a448d47c47fd6bf81745a6e50183dd1b339f9cbabe603a9b1869ba2ad8154a2f' 
  AND token = 'xJUX89fj5xMudBl6WZTAds6gd1r+Fv5+oG+xx7WXcPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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