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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170d694a6a40c5bb67173697ef78e0f5eb7146b5ef7d7e03800583748f167cb7' 
  AND token = 'csiZ0NFwImPA6+B7DbJskyK1+ZuMkt8WvI0ZNPyWgrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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