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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c7e2b205c40b4e5b6091fea1a7d8ebc6d6405b6d38438176d0af09f45a156d' 
  AND token = 'H3JANhOExHeSwKTVuqqS92Px3onAVfGK++0qCaLtf3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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