SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f4d429ca4cf932163584d51ae91c82d3476d85dc9baeca64e409a6c76e04b7' 
  AND token = 'JCZWuQDIbw/6Yp/kFfxxBsBSwhifY9Dqh2LUYoLqk+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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