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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc389b475202e7c4c8154a6de989c8300f822b48a95fde26ef7bd667fb4b5c3' 
  AND token = 'csdG/E6Xg5aGh9dtQNZMQGfhanb01ctKcjEb/z3uMlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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