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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835e2fe0c6c14b32f3c553cff9c8d136393dd042eded0e26cfb70aacbce53726' 
  AND token = '1m2xi2RST+B56/1A7VFlhjS8F8FO4WM6UOeC7WENUjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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